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preposterous

pre·pos·ter·ous

preposterous

 
pronunciation:
prih pa st rs
part of speech: adjective
definition: totally unlikely, unbelievable, or senseless; absurd.
Your conclusions from such weak evidence are preposterous.He was wearing a preposterous hat for such a formal occasion.The notion that her meek and law-abiding husband could be involved in a burglary was preposterous to her.
synonyms:
absurd, ridiculous, unbelievable
similar words:
cockamamie, crackbrained, farcical, impossible, improbable, inane, irrational, laughable, ludicrous, outrageous, senseless, unearthly, unlikely, unthinkable
derivations: preposterously (adv.), preposterousness (n.)